Three- to four-mark questions
These are similar to one- to two-mark questions but you will be expected to write in more depth for three- to four-mark questions.
The answers here give lists of valid points that could be included in your answer.
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Sample question 1 - Foundation
Question
The equation which links current, potential difference and resistance is:
potential difference = current × resistance
Calculate the potential difference across the battery in the circuit in Figure 3. [3 marks]
Potential difference = current × resistance [1]
= 0.4 A x (20 Ω + 10 Ω) [1]
= 0.4 A x 30 Ω
Potential difference = 12 V [1]
Show all stages of working out and include units in the answer.
Sample question 2 - Higher
Question
An electrician is replacing an old electric shower with a new one.
If the electrician touches the live wire when the mains electricity supply is still on, she will receive an electric shock.
Explain why. [4 marks]
The potential of the live wire is 230 V [1]. The potential of the electrician is 0 V [1]. Because there is a large potential difference between the live wire and the electrician [1], charge/current passes through the electrician's body and gives her an electric shock [1].
